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Laboratory Spherometer -HLSI
For accurate measurment of the radius of curvature of spherical lenses. Three pronged brass table with three pointed legs carries a vertical main scale from 10-0-10 mm on one of the prongs, and a micrometer scale on an brass disc with 100 divisons. The table has a screw at its centre with a pitch of 1mm. Giving a least count of .01mm.